hotsauce2007
Regular Contributor
This is not a sun but a a padlock (not the best icon draw ). I am not sure about the meaning but may refer to the SSL connection and the certificate of the DDNs.
In any case having a public IP it should work for you. Review your DDNS configuration page. Find enclosed how looks like mine. Maybe try with other provider to check if is related with that.
I did the entire process again, look how it finish: